Our intention is to head back homeward
on historic Route-66; but it no longer exists as an interstate
highway. Much of it is gone, parts left to go to seed, and a few
parts are restored and maintained, especially through towns seeking
tourism. From LA to Oklahoma City Interstate 40 replaces Rt-66. So,
we took I-40 except where reasonably maintained stretches of Rt-66
remain.

From
LA to Barstow, most of Rt-66 is a bit of a disaster. It has been
rerouted many times and has now been overgrown by the LA sprawl. So
we stayed on the I-15 and I-215. But, from Barstow to Needles there
is an intact section that runs thorough Amboy; parts of it are
actually in better shape than I-40. From Kingman to just east of Ash
Fork we took the longest continuous bit of Route-66, an easy RV
drive. East of Ash Fork there are only little bits and pieces of the
Mother Road; so we stayed on I-40. It is more or less uphill to
somewhere around Gallup NM, where I-40 crosses the Continental Divide
of the Americas (URL
Here).
From there it's more or less downhill into Amarillo.